Lay-Z-Spa Glacial Dip Cold Plunge Tub, 431L, 1-2 Person

The Lay-Z-Spa Glacial Dip is a cold plunge tub that assembles around a rigid galvanised steel frame rather than blowing up like a paddling pool. Lay-Z-Spa puts the capacity at 431 litres, the frame at 150 x 90 x 65 centimetres, and the seating at two people. At £129.99 it sits seventh in this guide of fourteen cold plunge tubs, and it is the cheapest listing here that carries a brand most buyers will recognise.

What puts it above some of the bigger-sounding tubs is that its own numbers hold together. A 431-litre bath inside a 150 x 90 x 65 centimetre frame is physically possible — the outside box works out at roughly 877 litres, so the stated capacity fills a little under half of it, which is what you would expect from a rounded tub with walls and a lid. That matters in this particular guide, because five of the fourteen listings state a capacity their own dimension field cannot physically hold. The one thing this listing does not settle is its own rating: the breakdown shows 12% of ratings at one star against an average of 4.3 from 36. Every figure on this page comes from the Amazon listing, not from any testing we have done.